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the reaction of magnesium with hydrochloric acid carried out in a calorimeter caused the temperature of water to change from 25.0 Celsius to 36.0 Celsius. In this reaction 3760J of energy was released . What mass of water was present?

Respuesta :

aabdulsamir

Answer:

81.69g

Explanation:

Initial temperature (T1) = 25°C

Final Temperature(T2) = 36°C

Heat energy = 3760J

Specific heat capacity of water (c) = 4.184J/g°C

Mass (m) = ?

Heat energy = Mc∇T

Q = mc∇T = mc (T2 - T1)

3760 = m * 4.184 * (36 - 25)

3760 = 4.184m * 11

3760 = 46.024m

M = 3760 / 46.024

M = 81.69g

Mass of water is 81.69g

raphealnwobi

The mass of water that was present in the reaction of magnesium with hydrochloric acid is 82 g.

The quantity of heat required to raise the temperature of a substance is given by:

Q = mcΔt

where Q is the energy = 3760 J, m is the mass, c is the specific capacity of water = 4.18J/g.K, Δt is the change in temperature = 36 - 25 = 11

3760 = m * 4.18 * 11

m = 82 g

Hence, the mass of water that was present in the reaction of magnesium with hydrochloric acid is 82 g.

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